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bug#23546: 25.1.50; scroll-restore-mode breaks comint-mode

From: Dmitry Alexandrov
Subject: bug#23546: 25.1.50; scroll-restore-mode breaks comint-mode
Date: Sun, 22 May 2016 04:34:30 +0300
User-agent: Mozilla/5.0 (X11; GNU x86_64; rv:31.0) Gecko/20100101 Icedove/31.3.0

On 19/05/16 15:56, martin rudalics wrote:
Hmm...  Probably I completely missed the point, but is not
‘scroll-restore-jump-back’ an option that enables the title
functionality of scroll-restore-mode — restoring the point position
after scrolling, thus simulating the behaviour of most editors, which
does not have that limitation of Emacs — that cursor position can be
on-screen only.

The aim of ‘scroll-restore-mode’ was much more modest: To move the
cursor to the position of ‘window-point’ after a sequence of scroll
commands have made that position invisible and then visible again.

‘scroll-restore-jump-back’ is much more aggressive: It forces the
position of ‘window-point’ to become visible again and move the cursor
to it after the first command which is not part of a sequence of scroll
commands that have made that position invisible.  If you are used to the
behavior of "most editors" where such behavior is the default, you might
like this.

Note, however, that the behavior I just described is not precisely the
behavior of these editors because, in addition to moving window-point
when it is scrolled off-screen, Emacs may also move window-point when it
enters the scroll margin.  Such movement is left alone by my algorithm.

Thank you for explanation.

How would you recommend to use it?  To write an advice around ‘keyboard-quit’ 
(like below), so scrolling would be ‘cancelled’ only with ‘C-g’?

(defadvice keyboard-quit (before scroll-restore-jump-back activate)

It depends on what precisely you want to accomplish (or what you are
used to).  But why on earth would you want to advise ‘keyboard-quit’?

To make ‘C-g’ and other keys that I bound to ‘keyboard-quit’ to ‘quit’ scrolling (if I may say so) too, of course. Should I redefine these keys instead?

I'll attach my latest version of ‘scroll-restore-mode’.  Please try it.
If you confirm that this version works

Yes.  My appreciations to you.

and doesn't break anything else,

I could not try anything, of course, but at first sight it does not.

All you have to do is use it for a sufficient amount of time.  I'm
confident that there are unresolved issues left.

And you are right. There is one of them: now it breaks macros that involve isearch. Suppose that macro:

C-x ( C-s sit RET SPC bar C-x )

By executing it on a line:

¦Lorem ipsum dolor sit amet.

instead of:

Lorem ipsum dolor sit bar¦ amet.

I get:

r¦ab Lorem ipsum dolor sit amet.

(‘¦’ denotes point).

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